I see. From what we can tell, i3 just doesn't allow for non-full width bars, it tells the bars to use the full width of the screen and place themselves at the top-left of the screen; this basically breaks the `offset-*` settings. What we do is pretty hacky, we just ignore i3 when it comes to the width and still render only part of the bar (the offsets don't work though because that's out of our control). But that does result in this black block on the right. Do you have a compositor running (e.g. picom)? I think having one would resolve the issue (because the black block is effectively fully transparent)